Service Infiniti QX4 since 1996 of release
1. Introduction
2. The maintenance instruction
3. Routine maintenance
3.1. The routine maintenance schedule
3.2. Specifications
3.3. The general data on options and adjustments
3.4. Check of levels of liquids
3.5. Check of a condition of tyres and pressure of their rating, rotation of wheels
3.6. Replacement of impellent oil and the oil filter
3.7. Check of a condition and replacement of the hoses located in an impellent compartment
3.8. Service of system of cooling (опорожнение, washing and refuelling)
3.9. Check, service and gymnastics of the storage battery
3.10. Check of a condition and belts of a drive of auxiliary units
3.11. Replacement of spark plugs, check of condition ВВ of electroconducting
3.12. Replacement of a filtering element of an air cleaner
3.13. Check of a condition and replacement of brushes of screen wipers, procleaning and adjustment snuffled givings of a washing liquid
3.14. Survey of components of a suspension bracket and a steering drive, check of a condition of protective covers of power shafts
3.15. Check of brake system
3.16. Check / adjustment of installations of turns of idling / a corner of an advancing of ignition / qualities of an air-fuel mix
3.17. Electric equipment check
3.18. Check of serviceability of functioning and service of systems of heating and an air conditioning
3.19. Greasing of locks, loops and an emphasis
4. The engine
5. Cooling and heating systems
6. Power supply systems and managements
7. Start and charge systems
8. A transmissionnaja line
9. Brake system
10. A suspension bracket and a steering
11. A body
12. An electric equipment


3.11. Replacement of spark plugs, check of condition ВВ of electroconducting

The spark plug consists of the central electrode, an insulator with the case and an electrode (ов) weights. Between the central electrode and a weight electrode the spark igniting an air-fuel mix slips. It is not necessary to apply the spark plugs which are distinct from the recommended. The recommended type of candles is defined among other калильным by number.

The kalilnoe number characterises degree of thermal loading of a candle. The more low калильное candle number, the above degree of its thermal loading. Thus the candle takes away heat thanks to what possibility калильного ignitions of a fuel mix is excluded is better. The candle with the high thermal characteristic has that lack that its temperature of self-cleaning lies above. It is more inclined to deposit formation, in particular when the engine in an operating time often does not reach the working temperature, for example movement in a city, short movings in the winter.

Correct калильное the candle number is defined by the manufacturer of the car. There are candles with one or several electrodes of weight, with various length of a carving and its diameter. At candle replacement it is necessary to establish only the candles corresponding to instructions of the manufacturer of the car.

Average service life of a candle is distinguished. Thus the serious role is played also by a material of electrodes. Chrome-nickel an alloy is characterised by very high heat conductivity and firmness to corrosion influence. The best heat-removing properties silver whereas platinum electrodes differ high anticorrosive properties and firmness against обгорания possesses. Service life of candles makes from 20 000 to 100 000 km of run, depending on a material of electrodes and their quantity.

Depending on a design of the engine of a candle distinguish as landing consolidation in a head of cylinders.

At flat landing the sealing ring which is usually fixed on the case of a candle is used and to removal is not subject. Candles конусной landings in application of additional sealing elements do not require and differ in more compact sizes.

Service life of spark plugs with the covered layer of platinum the central electrode considerably above than at candles of other types.

Correctness of functioning of spark plugs appreciably defines efficiency of return of the engine. It is important, that on the engine candles of corresponding type (on models Infiniti QX4 candles with platinum electrodes are regularly established) have been established.

Necessity for off-schedule service of spark plugs arises extremely seldom provided that actually the engine is in good repair. In order to avoid casual damage of electrodes, it is not necessary to make cleaning of candles without application of the special equipment.

In most cases for replacement of spark plugs presence of a special candle head (with the elastic loose leaf inside) complete with a ratchet drive is necessary, and also a set for a safe detachment of tips ВВ of wires from shafts of spark plugs the special tool though its application and is not strictly obligatory also is issued. Use динамометрического a key will allow to achieve correct effort of a tightening of candles.

Before to turn out candles their adjusting niches it is necessary to blow compressed air for the purpose of prevention of hit of dust in cylinders, — most easier to take advantage of the usual bicycle pump).

Check of a condition of candles gives good representation about an engine condition. If on an insulator of the central electrode completely there are no traces of any adjournment, it says about repauperization of an air-fuel mix, or that excessively "hot" candle (heat removal from an insulator to the case on "hot" candles is used occurs much less intensively, than on "cold").

Presence on electrodes of a black deposit testifies to mix reenrichment and if the deposit thus still has an oily consistence, it is necessary to think also of more detailed estimation of degree of deterioration of internal components of the engine.

The touch of a golden or grey-brown shade on an insulator confirms serviceability of a condition of the engine and correctness of configuration of an air-fuel mix.

Verify the turned out candle with a card of conditions that will allow to estimate the general condition of the engine qualitatively.

Card of conditions of spark plugs

Typical damages of spark plugs

Coal adjournment

Symptoms: soot Presence specifies in reenrichment of a toplivno-air mix or weak intensity of a spark. Causes ignition admissions, complicates start and leads to instability of work of the engine.
Recommendations: Check up, whether the air cleaner is hammered, whether fuel level in поплавковой to the chamber is not too high, whether is jammed air заслонка and whether contacts are not too worn out. Try to use candles with longer insulator that raises resistibility to pollution.


Symptoms: zamaslivanie candles it is caused by deterioration маслоотражательных caps. Oil gets to the combustion chamber through worn out directing valves or piston rings. Causes ignition admissions, complicates start and leads to instability of work of the engine.
Recommendations: Make mechanical restore


Symptoms: the Porous, white insulator, erosion of electrodes and absence of any adjournment. Leads to reduction of service life of a candle.
Recommendations: whether Check up corresponds to requirements of Specifications калильное number of the established candles, whether the corner of an advancing of ignition is correctly exposed, whether too poor toplivno-air mix moves, whether there are no leaks of vacuum of the inlet pipeline and whether valves are jammed. Check up as level of a cooler and whether the radiator is corked.

Too early ignition

Symptoms: Electrodes are melted off. The insulator has white colour, but can be and is polluted owing to admissions of ignition or hit in chambers of combustion of extraneous particles. Can lead to an engine exit out of operation.
Recommendations: Check up калильное number of the established candles, a corner of an advancing of ignition, quality of a mix (whether it is not too impoverished), whether the system of cooling is corked and whether the greasing system normally functions.

Electrospending luster

Symptoms: the Insulator has yellowish colour and the polished kind. Speaks about sudden rise in temperature in combustion chambers at sharp acceleration. Usual adjournment are thus melted off, taking a form of a varnish covering. Leads to ignition admissions at high speeds of movement.
Recommendations: Replace candles (colder, at preservation of a manner of driving).

Short circuit of electrodes

Symptoms: the Waste of products of combustion gets to interelectrode space. Firm adjournment accumulate, forming a crosspiece between electrodes. Leads to ignition refusal in the cylinder.
Recommendations: Remove adjournment from interelectrode space.

Candle normal state

Symptoms: Gray-brown colour and easy deterioration of electrodes. The kalilnoe number of candles corresponds to type of the engine and its general condition.
Recommendations: At replacement of candles establish candles of the same type.


Symptoms: Soft brownish colour of adjournment on one or both electrodes of a candle. A source of their formation are applied additives to oil and-or fuel. Excessive accumulation can lead to isolation of electrodes and cause admissions of ignition and astable work of the engine at acceleration.
Recommendations: At fast accumulation of adjournment change маслоотражательные caps that will prevent oil hit in combustion chambers. Try to replace fuel mark.


Symptoms: the Rounding off of electrodes with a small congestion of adjournment on the working end. Colour normal. Leads to difficulty of start of the engine in cold damp weather and to increase of the expense of fuel.
Recommendations: Change candles on new, the same type.


Symptoms: Insulators can appear chopped off or треснутыми. The inaccurate technics of adjustment of a candle backlash can result In insulator damage also. Can lead to damage of pistons.


Symptoms: After admissions of ignition during a long time interval of adjournment can be loosened at preservation of working temperature in the combustion chamber. At high speeds of adjournment in flakes come off the piston and stick to a hot insulator, causing ignition admissions.
Recommendations: Replace candles or smooth out and establish into place the old.

Mechanical damages

Symptoms: Can be caused hit of extraneous materials in the chamber of combustion or arise at piston blow about too long candle. Lead to refusal of functioning of the cylinder and to piston damage.
Recommendations: Remove from the engine extraneous particles and-or replace.

In candles with one lateral electrode on the foreground there is a factor of correctness of installation of the interelectrode backlash which size defines intensity искрообразования and, as consequence, correctness of ignition of a mix and development of process of its combustion in all modes of operation of the engine. Installation of interelectrode backlashes should be made according to instructions of manufacturers of candles.

Composers of the present Management are solidary with manufacturers Infiniti and do not recommend to make attempt of restoration of regularly established candles with platinum electrodes by зачистки the last and updating of an interelectrode backlash.

Measurement of size of an interelectrode backlash on candles of adjustable type is made by means of special щупа wire type.

At updating it is necessary to turn in only a lateral electrode, — attempts of deformation of the central electrode are fraught with irreversible damage of an insulator. The nozzle for updating of position of an electrode usually is included into the complete set щупа.

If to measurement of a candle backlash it is applied usual щуп лезвийного type, it is possible to consider a backlash adjusted correctly when an edge () щупа take place in it with easy resistance.


  1. Before candle installation make sure that the carving tip (shaft) is densely screwed, and a carving on the case and an external surface of a candle are well cleaned.
  1. Manually acquire one of new candles in a corresponding aperture in the engine. Having made sure that the candle is not warped in a carving, tighten it with demanded effort (at presence near at hand динамометрического a key). For simplification of procedure наживления candles pull on its shaft a piece of a flexible fuel hose, — the probability of failure of a carving as at the slightest закусывании the hose will start to be turned simply is thus excluded. Operating in a similar manner, establish all remained candles.
  1. Before to connect to spark plugs ВВ of a wire, execute procedures of service of the last (see more low).
  2. Connection to candle ВВ of a wire is carried out by vrashchatelno-progress of its tip, — last should sit down densely on a candle shaft (pay attention to marks of wires).

Check of a condition of candle wires

Check of condition ВВ of electroconducting should be made without dependence from that, replacement of spark plugs was made, or not.


  1. Check begins with external survey of isolation of wires at the working engine. Tyre out the car in a dark premise, start the engine and make sure of absence искрообразования on wires. Искрообразование is a sign of breakdown of isolation. Try not to touch moving components in an impellent compartment. Make necessary marks on replacement of defective wires, then allow to the engine to cool down.
  2. Check of candle wires is made serially in order to avoid infringement of an order of their connection at assemblage. Usually on isolation of firm wires there are corresponding marks. In case of absence that, put it independently by means of an adhesive tape and a marker.
  1. Disconnect ВВ a wire from a spark plug (is better take advantage of the special tool). At all do not pull for a wire, only for its tip.
  1. Attentively examine internal walls of a tip. Corrosion is usually shown in the form of fragile коркообразного a touch of white colour.
  2. Pull a tip back on a shaft of the candle, make sure of density of its landing. In case of need again remove a tip and turn in plugs in a rubber cover.
  3. Pure rags wipe a wire on all its length, completely having removed from a surface of isolation dirt and greasing traces. Examine wire isolation on presence of cracks, traces прогара and other damages. Try not to bend a wire under acute angles in order to avoid infringement of integrity of veins of a conductor in isolation.
  4. Check up a condition of contacts of wires from outside the ignition distributor, — again pull only for a tip.

Replacement ВВ of electroconducting should be made the complete set, even in case of failure only one of wires.

Even at an excellent condition of system of ignition, at for start-up in crude weather there can be failures, — in case of need spray system elements влагопоглощающим a spray, — ask in shops of automobile accessories.

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3.10. Check of a condition and belts of a drive of auxiliary units
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3.12. Replacement of a filtering element of an air cleaner